Rubbing, sanding, and polishing machine



Aug. 19, 1930. w. J. MADDOX 1,773,466

RUBBING, SAI IDING; AND POLISHING MAC H INE Filed June 20, 192s 5 Shets-Sheet 1 ,r to,

Aug. 19, 1930. w. .1. MADDOX AND POLISHING MACHINE RUBBING, SANDING Filed June 20, 1325 5 Sheets-Sheet 2 wue'rdoz attozwew Aug. 19,1930. w. .1. MADDOX 3,

RUBBING, S/ANDING, AND POLISHING MACHINE Filed June 20, 1925 5 Sheets-Sheet 3 wulmllulllllluu quumfimm nmupwwwm Q 6 Aug. 19; 1930.

w. J. MADDOX RUBBING, SANDING, AND POLISHING MACHINE Filed June 2O, 1925 5 Sheets-Sheet 5 Patented Aug. 19, i930 1 U'NiirEo .STATES PArENro FicE" f WILLIAM J. vrAnnox, or .rAMEsTowN, NEW, YoRK 1 1 Resume, sanmne, nun sommmmcnma Application filedjJ'une 20, 1925. fseriai'n 38,455.

. construction of the "operating parts of'the 1 machine and to provide a machinehaving a wider range of utility than heretofore;

In this simplification of construction of the machine, the operating parts have'been. so arranged and co-ordinated that they are all capable of being actuated bya single motor carried on the machine. frame, sothat the machine, as shipped by the manufacturer, is a complete working unit. I A i other tools carried on a reciprocatory-mem 1 her, usually a belt, that extendsover or across a work support, and to increase the capacity .30 of the machines-they have generally been equipped with a belt reciprocating mechanism that can be adjusted to vary the degree of reciprocation of the belt. 1 To the same end, they havealso been so constructed that the Worltsupport could be adjusted .towardand from the rubber and the belt on which said rubber is carried. Mechanisms having similar functions are also embodied in the present machine, but the; mechanisms contemplated 0 by this invention have been devisedwiththe idea of making themoperable by power .de. rived from themotor which is also used for reciprocating the belt. addition said mechanisms have been so arranged in the present machine that the work support may be raised or lowered through said motor without interrupting the movement of saidbelt and the extent of movement of said beltmay likewise be mechanically varied withoutstopping its 'reciprocatory motion. p

Machines of this type are described and As is well known in the art, machines ,of' this characterhave oneormore rubbers or "and; rocker member;

in Fig. 7; the pitnian being shown'in section;

nected'tov said member.

"Withtheseand other objects in view, the invention consists in. certain novel details of construction and combinations and1arrangements ofparts, all as will hereinafter be more fully described and the novel features thereofv particularly pointed" out in the appendedclaims- Inthe-Iaccompanying drawings,;-

' Figure 1. 's a front elevatlon of a machine embodying the present invention, the several v o features being shown in their. preferred form,

' Fig. 2 is an elevation of the right hand end of the machine illustrated inFig. 1, some of the parts located behind the end frame, .etc.,

being shownindotted lines;- b

Figi 3 is a-sectional viewon the line 33 of Fig. 1, lookingvin'the direction indicated by the arrows. 1 jv Fig. 4 isa sectional View of the motoroperated connections for varying the extent 7 ofrreciprocation of the belt on which the rub b eris'carried; V r 1 Fig.6 is an end view, taken from the right hand end of: Fig. 4, the crank'wheelbeing shown in dot and dash lines I Figitiis ahorizontal sectional view on the line 6'6-of Fig.1; I f

' Fig; 7 is a side view of the-upper portion of thepitman and the rocker member for im- I parting the'reciprocatory motion to said belt;

ig. 8 is a somewhat enlarged view illustrating the connection between the'pitman F g. 9 is a top plan view of the parts shown v 7 Fig. 10 is an edge view of the structure illustrated'in Fig.8; a V :Fig." 11 is a perspective View of a'portion. v of the rocker member to'more clearly illustrate the way in which the pitman is con-' '90 Fig. 12-.is .a. detail sectional view of the small-pulley shown in Fig. 9. I ,1 Fig. 13 is a detail'sectional view onthe line .13 1-3'ofF.ig.4.f I w In its preferred construction,- the machine frame is composed of standards 10, the space between the standards being bridged by front r l and rearframemembers 11, 12, mounted on the upper ends of said standards. The standbrackets 14 may be slidably attachedtothe.

standards 10 as by forming the arms ofthe channels with beveled, ;outwardly disposed flanges 18 with which corresponding flanges 19 on said brackets cor-operate, shims-20being interposed between the surfaces of. said flanges to compensate for clearance .that may be found desirable for purposes of assembly.

Above thework-table 1?, is a reciprocatory belt or other tape-like member 21 on which is secured one or more rubbers or similar: tools 22 whichare adapted to be moved back and forth over the surface of the materialbeing treated, that is, rubbed, sandpapered, or polished. In the present invention, said'tools 22 are carried on the lower reach of belt 21, the intermediate portion of said belt-being passed around a pulley 23 loosely journaled adjacent one end of the tablel? andframe and the ends thereof secured to a pulley 24 mounted on the forward end of a transverse shaft 25 journaled in frame members 11, 12. It will be observed that the entire belt is located above the work table 17 and in order that the pulleys 23, 24 may accommodate said belt, loose pulley 23 is arranged at an'angle tothe plane of-rotation of pulley 24and the latter is made of increased width corresponding to substantiallytwice the width of the belt. it convenient and secure method of attachin the belt ends to pulley 24 is'illustrated inFigsi'i, 8, 10 and 11. As shown, the pulley may'have a central web on each side of which there are a plurality of spokes, and one spoke 29 on each side of said web has-a threaded socket 26 therein. The ends 21 and 21 extend aroundthe pulley in opposite directions, the end portion 2l extending through a transverse slot 27in spoke 29 and the end 21 extending through a similar slot in the corresponding spoke on the other side of the central web, said slots extending through the periphery of the pulley. Each end is doubled back upon itself and fastened, as by rivets, to prevent lengthwise withdrawal of the belt through slot 27 and, as each slot is open at the side of the pulley to permit lateral insertion of the belt after said end has been doubled back, a bolt, carrying a washer 28, is turned home in the threaded recesses in the spokes. These washers 28 overlie the open sides of slots 27 and prevent accidental displacement of belt end'in alateral direction.

In order that the inclination of pulley 23 and aspring 49 surrounding said post yield- F ingly-urges therear end of member 44 upwardly. By moving the nut 42 on said post, the shaft 41, which is slightly offset with respect tomember 44, may be raised or low ered to vary the inclination of the pulley 23 with respect topulley 24. The slide 45 has awthreaded projection 46 into which is screwed a threadedshaft47 journaled in the frame andwhoseouter end is provided with a hand wheel'48. The tension on belt 21 can be adjusted by turning said hand wheel to move the slide 45 and pulley 23 toward or away from pulley 24.

To reduceandsimplify. the parts necessary to, impart a, reciprocatory motion to the belt 21, the; present invention contemplates the useof a motor 30 that may be mounted on a shelf projectingfrom one of the frame standards:;10.- The shaft of said motor 30 has mountedvthereon a pinion 31 which meshes 3-;

with teeth 32 on. a'crank wheel 33.- For purposes later appearing, crank wheel 33 is mountedon a sleeve34journaled in suitable bearings 35provid'ed in the arms ofa bracket 36 carried, by the standard 10. Connected 'eccentrically tosaidcrank wheel 33 is a pitman137j: thatprojects upwardly into proximityjto'a rocker member or drum 38 mounted at the rear end of shaft 25'which carries the pulley 24. Two tape-like members 50, 51, or otherv flexible connectors areattached at one end to pitrnan 37 and are passed around the rocker or drum 38 side by side, in opposite directions. Said drum, like pulley 24, has aicentral web and a slotted spoke on each side of'said web, the opposite ends of said connectors 50,51 being received in said slotted .spokesand secured therein by doubling said endsand applying washers 52 and bolts to said spokes. as used for securing the ends of belt 21 in pulley24 and no further description is deemed necessary. rocker- 38and pulley 24 and the consequent reciprocation of belt 21 will be understood from the foregoing. Suffice it to say, that as pitman'37 moves upward (see Fig. 7) belt 50 will tend to unwrap itself oif of-the rocker, thusturning the rocker in a clockwise direction, and as said pitman descends, belt 51, which, at that time, will be either partly or wholly'wrapped around the rocker (depending on'the throw given the pit-man), will turn the'rocker in the reverse direction. During this reverse rotation, belt 50 will again be It is believed the oscillation of This is the same arrangement.

the belt 21 and tools carried thereby,- Such mechanisms have been provided in diiferent prior structures, but in most instances, if not all, it has been necessary to stop themachine to make the adjustment. In the present construction, however, this adjustment may be made without stopping the machine'and, in

fact,v such adjustment is preferably perjformed with power derived from motor 1 that, asbefore described, actuates the crank wheel 33 and pitman 37. In the preferred arrangement for accomplishing this object (see Fig. 4), the endof pitman 37 adjacent the crank wheel is not directly attached to said wheel but is, on the contrary,'pivoted by Wheel.

a pin 58 on a disk 53 carried by. abolt 54 which extends through the crank wheel; *Also 7 carried by said bolt, but firmly attached to said disk 53 is a gear 55 with which meshes a pinion 56 mounted on anend of a shaft 57 extending-through the sleeve 34:. on which said, crank wheel is mounted. At its opposite end,ishaft57 carries a ear59 adapted to mesh with a gear. 60 on a stub shaft 61 journaled in arms of bracket '36, and loose on said stub shaft is apair of gears '62, 63 mesh- '1 ber 16. At the opposite "end of the machine on shaft 77, there is mounted a hand lever 7 2 a and pivotedvto said lever at 7 3i'is a link 74,

ing witha second pair of gears 64, 65, mounted on the sleeve 34 carrying the crank wheel. I Solong as gearsi62, 63 idle on: said stub shaft 61, there will-be no relative movement vof the'gear 55' andpinion 56, the latter rotating sat the same speed at which the former is carried around the center of the crank As illustrated in Fig. 5, the pivot 58 is located in its-remotestposition with respect to the center of crank wheel 33, under -whichclrcumstancesthe maximum reciprocas support; 1

tory motion will be imparted to belt 21. In order that thisstroke may be; varied, however, gear 64 is made smaller than gear 62, adifierence of one tooth being sufficient and [likewise gear 63 on stub shaft 61' is made smaller than gear 65; By clutching in, say larger gear 62 on stub shaft 61, said shaft 1 .will be rotated at a speed slower than sleeve 34 and wheel 33, and by reason of gears 60, 59, pinion56-will be held to a speed corresponding to that of shaft 61,.For this reason, pinion 56 will be heldback, soto speak, with respect to the-bodily movement of gear 55, resulting in saidgear 55 and the disk 53'torwhich pitman-37 ispivoted being turned on bolt 54 in a counterclockwise di' rection, thereby moving the pivotal connecp v .80 andshafts 76 the brackets 14 and tracks course; continue'fso long as the gear '62 is the varying areas of the surfaces to be operated upon, it is, of course,

necessary to provide means for correspond-I ingly varying the extent of'reciprocation'of *clutched lto stub shaft 61. Consequently,

whenthe center of the pitman connectionhas pitma-n, clutch 66 is moved into engagement with gear 63 which is smaller than gear on sleeve 34:. 'With these gears-in mesh, the shaft 56 of pinion 56 will rotate faster than sleeve t landthe crank wheel and thereby v cause disk 53 to rotate in a clocl'rwise'direction'tomove the :pivotal connection of the gpitman outward toward the periphery of the crank wheel. Clutch 66 is operable by clutch lever. 100at the front of the machine (See Fig. Y 7

It might here be stated that the outerextremityof pitmanu37 has a guide 67 thereon which works in arguide slot '68 formed in the rocker member 38 so asto-prevent any' later'al movement of said vpitm'an with respect to the rocker. g ,6

It is sometimes desirable and convenient to tilt the work supportor table 17 and to this end, the-sliding brackets'l l; to whichbthe track members 16 are pivoted, are formed with extensions 69-(see Fig; supporting'a longitudinal shaft 77 at one end of which there issecured a link 70 having pivotally connected thereto a second link 7 Lwhich, in turn, is" pivoted to the adjacent track meniwhich, like j link '71, is pivoted to; adjacent 7 track member 16." The work support 17 is in dotted linesin the drawings, links 71,74 o

will be? moved tothe positions indicated in dotted lines in said figures, thereby dropping or lowering the forward edge of the Itis also' desirable'to have the work sup lll) port bodily movable toward and away' from the rubbers 22, either to accommodaterela- For this reason the brackets 14 have lugs 75 formed thereon *whiCh lugs have threaded apertures for coeoperation with" vertically disposed screw threaded shafts or posts/76 journaled at their' lower ends in'the bases 13 of the standards At their upper extremities, 7 said shafts 76 are provided with bevel gears 78, thetwo gears meshingwith similar gears 79 on a longitudinally extending shaft 80 journaled; intheframe. By rotating shaft 16, carrying-the work. support are-movable -rupwardior downward on said-shafts 7 6,= deablewith respect to the carriage sc'that toe pending upon the direction of rotation of the shafts.

Shaft may be operated by a. hand wheel 81 located, for instance, at the end of the frame, but, if desired, said shaft may be driven by power derived from themotor 30. The preferred connections for accomplishing this, comprise sleeve 34L which carries. two slidable bevel gears 82, 83 movable into. and

out of mesh with a bevel gear 8 1 on a shaft .85. Said gears 82, 83 are. shown in neutral either one or the other direction, depending upon which of said gears is in engagement with gear 84. As will be noted, these motor driven connections for raising or lowering the work support are operable without interfering with the operation of belt 21. j 7 Another feature contemplated by the pres ent invention consists in an arrangement whereby an increased or differential movement'of work support 17 is secured. In said arrangement a carriage for said support interposed between the support proper and the tracks 16, said carriage being movable along the tracks and the support being movdistance traveled by the support will be in excess of that traveled bythe carriage. [as a convenient and simple'construction for accomplishing this result, the carriage iscomposed of two shafts92 journaled in tie bars or spacer rods .93 and near th ir'ends said shafts carry rollers 9d. 95 adapted to roll on tracks 16. Rollers 95 are grooi 'ed and straddle track 16 to prevent lateral play or movement of the carriage on the track and the ends of said shafts project beyond the rollers so as to engage a stop 96 on track member 16 at the extremes of nioveni the carriage. between collars 97, 98 on shafts 92 and spaced from each collar 98 is another collar 99, these spaced collars 98, 99, forming grooves or guideways in which are received guides 101 on the bottom of the work support. The table or support 17 rests loosely on the shafts 92 between said collars and, a. will be understood, when the carriage moves along tracks 1.6 and shafts 92 turn, the support will not only be. carried bodily by the carriage, but it will also roll on the r volving shafts, thus imparting to it a greater travel transversely of the belt than that had by the carriage. The support proper maybe supin Fig. 1.

ported on the carriage in any desired Way,

two forms of collars and guides being shown At the right hand end of the frame, adjacent faces of collars 98, 99 divergeand the sides of guide 101 are beveled,

whereas tl1e;adjacent faces ofthecollars at the left end of the machine are parallel and the, sides of the guide on the. support are likewise parallel.

In so far as the rubbers or other tools 22 are concerned, it suffices to say that they may be of any desired construction. They are adapted to slide freely ona cross bar or guide 102 mounted on the frame, their sliding movement being imparted to them by belt 21 to which they are clamped. A detail description of a rubber is to be found in my prior Patent No. 668,533, heretofore referred to.

In the preferred construction, as shown in Figs. 1 and 3, the top plate 103 of each rubber embraces the. guide bar 102 and the latter is suspended from pins 104 threaded through lugs 105 on plates 106 which are slidable in ways formed'in plates 107 bolted to the. front of side. frame 11 adjacent the ends of the machine. The sliding plates 106 also have threaded lugs 108 which receive the threaded portions ofshafts 109 that extend loosely through apertures inan overhanging portion 11.0 of the fixed plates 107.-

ihe upper ends of shafts 109 project above said overhanging portion and have fastened thereon heads 111, said slides and the cross .barsuspended therefrom, actually being supported by the heads 111 engaging the'overhanging portions 110 of the fixed plates 107. A spring 112 is interposed between overhanging portions'11'0 and offsets on shafts 109 to yieldingly hold the cross bar down, but, shafts 109 being loose in portions 110, the entire bar is free to rise and fall to accominodate any undulations in the surface of the ed vertically tovary the pressure exerted bythe rubbers on the surface being rubbed.

As isbest illustrated in Fig. 1, all-of the major operating parts are located at the end of the machinebeyond the boundaries of the work support, there being no obstructions of any nature to prevent lowering saidsupport to substantially the floor level. This increased clearance below the supportis a great convenienceiwhen moving heavy articles on or off the support and also permits large articles to be accommodated by the machine.

I claim 1. In a rubbing machine, the combination of a frame, a work support, a pulley journaled near one end of thework support, a.

1' shaft journaled near the opposite end of the Work support, a double pulley mounted on said shaft, means for rocking said shaft and oscillating said double pulley, a belt extendingaround the loose pulley and having its ends secured to and extending in reverse directions around the double pulley, said loose I one of the reaches of said belt.

shaft, means for rocking said shaft and oscillating said double pulley, a belt extending around the loose pulley and having its ends secured to and extending in reverse directions around the double pulley, said loose pulley being disposed at an angle to the plane of rotation of the double pulley whereby the end portions of said belt may lie side by side on the double pulley, and means for adjusting said loose pulley to vary its inclination with respect to the plane of rotation of the double pulley.

3. In a rubbing machine, the combination of aframe, a work support, a pair of pulleys carried on said frame", a belt on said pulleys extending overthe work support, a rubber on said belt, a motor, a motor driven shaft,'a

' crank wheel on said-shaft,a pitman connected to said crank wheel, connections between said pitman and one of said pulleys for'imparting said stub shaft, themajor gear on the stub shaftco-operating with the minor gear on the crank Wheel shaft,'and the minor gear 011 the said stub shaft co-operating with the major gear on the crank wheel shaft, and means for makingone or the other ofsaid major andminor gears on the stub shaft fast on said shaft whereby the pinion shaft may be driven at a speedlessthan or in excess ofthe speed of the crank wheel shaft} 5. In a rubbing machine, the combination ofa frame, a work support, an oscillatory belt extending over said support, a rubber on said belt, means for oscillating said belt coinprising a'motor, a motor driven shaft, a crank Wheel on saidshaft, a disk journaled eccentrically on said Wheel, a pitman eccentrically connected to said disk,connections between said belt and pitman, and means for varying the throw of said pitman comprising a second shaft concentrically arranged with the first mentioned shaft and projecting beyond oppositeends thereof, a gear on one end of said s'econd shaft, a pinion'on the other. end thereof, a gear attached to and concentric with said disk and engaging saidpinion, and connections between the motor and said second shaft for, driving thelatter at speeds varying from the speed of the shaft first mentioned.

WILLIAM J. MADDOX. f

a reciprocatory movement-to the belt, and 7 means operable at will from said motor for varying the throw of the pitman, said means comprising a shaft rotatable withinsaid motor driven shaft, a pinion thereon operative- 1y associated with the connection between said pitman and crank wheel for moving the end of said pitman connected to the crank wheel toward and'from the center of rotation of said wheel. 7

4; In a rubbing machine, the combination of a frame, a work support, an oscillatory belt extending over the support, a rubber on said belt, means for oscillating said belt compris ing a motor, a-motor' driven shaft, 'a'crank wheel on saidshaft, a diskjournaled on said the throw ofthe pitman, said last-mentioned means comprising a gear connected to said disk, a pinion'me'shed; with said gear, a shaft on Wh1ch sa1d pinion is mounted, a gear on L said'pinion shaft, a stub shaft, a gear mount- 1 ed on said stub shaft, and meshing with the gear on the pinion shaft, a pair of major and j of major and minorgears'loosely secured on minor'gears on the crank wheel shaft, a pair 65 

